Why Does My Lower Back Hurt When Sitting?

March 16, 2026

Lower back pain when sitting is one of the most common complaints among people with desk jobs or sedentary lifestyles. Spending long periods sitting places increased pressure on the lumbar spine and surrounding muscles, which can lead to stiffness, discomfort, and persistent back pain.

If you regularly experience pain while sitting at work, driving, or relaxing at home, understanding the underlying causes is the first step towards improving your spinal health.

Why Sitting Can Cause Lower Back Pain

When you sit for extended periods, the natural curve of the spine can become flattened. This increases pressure on the spinal discs and supporting muscles.

Common factors include:

  • Poor posture
  • Weak core muscles
  • Tight hip flexors
  • Lack of movement during the day
  • Unsupportive seating

Over time, these factors can contribute to muscular tension, joint stiffness, and chronic discomfort in the lower back.

For more information about treatment options, see our lower back pain treatment.

Common Causes of Lower Back Pain When Sitting

Poor Sitting Posture

Slouching or leaning forward places strain on the muscles and ligaments that support the spine.

Good posture should include:

  • Feet flat on the floor
  • Hips level with or slightly higher than knees
  • A neutral spine position
  • Shoulders relaxed

Weak Core Muscles

Your abdominal and back muscles help stabilise the spine. Weak core muscles can increase the likelihood of back pain during prolonged sitting.

Tight Hip Flexors

When sitting for long periods, the hip flexor muscles shorten. This can pull on the lower spine and create discomfort when sitting or standing.

Herniated or Bulging Discs

In some cases, persistent lower back pain may be caused by disc problems in the spine.

The UK’s National Health Service notes that most cases of back pain improve with conservative treatment, movement, and professional care.

Simple Changes That May Help Reduce Back Pain

Small adjustments to your daily routine can often make a significant difference.

Improve Your Desk Setup

Ensure that your workstation is ergonomically set up.

This includes:

  • Monitor at eye level
  • Chair supporting the lower back
  • Keyboard at elbow height

Take Regular Breaks

Standing and moving every 30–60 minutes can help relieve pressure on the spine.

Stretch During the Day

Gentle stretches for the hips, hamstrings, and lower back can improve mobility and reduce tension.

When Should You Seek Professional Advice?

If your lower back pain:

  • Persists for more than a few weeks
  • Radiates into the legs
  • Is associated with numbness or weakness

it may be advisable to seek professional assessment.

Chiropractic care focuses on improving joint mobility, reducing muscle tension, and supporting spinal function.

The General Chiropractic Council regulates chiropractic professionals in the UK and ensures practitioners meet strict safety and training standards.

How Chiropractic Care May Help

A chiropractor may assess:

  • posture
  • spinal alignment
  • joint mobility
  • muscle tension

Treatment may include:

  • spinal adjustments
  • soft tissue techniques
  • rehabilitation exercises
  • posture advice

Book an Appointment

If you are experiencing back pain and are looking for a chiropractor in Northampton, professional assessment may help identify the cause.

Contact Duston Chiropractic Clinic to arrange an appointment.